From patchwork Fri Jul 26 21:43:11 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kuppuswamy Sathyanarayanan X-Patchwork-Id: 11061859 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 336E914DB for ; Fri, 26 Jul 2019 21:46:37 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 25BD928B77 for ; Fri, 26 Jul 2019 21:46:37 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 1A45F28B7F; Fri, 26 Jul 2019 21:46:37 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 8546F28B81 for ; Fri, 26 Jul 2019 21:46:36 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726276AbfGZVqb (ORCPT ); Fri, 26 Jul 2019 17:46:31 -0400 Received: from mga14.intel.com ([192.55.52.115]:28904 "EHLO mga14.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727934AbfGZVpu (ORCPT ); Fri, 26 Jul 2019 17:45:50 -0400 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga005.fm.intel.com ([10.253.24.32]) by fmsmga103.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 26 Jul 2019 14:45:50 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.64,312,1559545200"; d="scan'208";a="369671130" Received: from skuppusw-desk.jf.intel.com ([10.54.74.33]) by fmsmga005.fm.intel.com with ESMTP; 26 Jul 2019 14:45:49 -0700 From: sathyanarayanan.kuppuswamy@linux.intel.com To: bhelgaas@google.com Cc: linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, ashok.raj@intel.com, keith.busch@intel.com, sathyanarayanan.kuppuswamy@linux.intel.com Subject: [PATCH v6 1/9] PCI/ERR: Update error status after reset_link() Date: Fri, 26 Jul 2019 14:43:11 -0700 Message-Id: <6be594215ae2ea0935d949537bfb84ff9e656a36.1564177080.git.sathyanarayanan.kuppuswamy@linux.intel.com> X-Mailer: git-send-email 2.21.0 In-Reply-To: References: MIME-Version: 1.0 Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Kuppuswamy Sathyanarayanan Commit bdb5ac85777d ("PCI/ERR: Handle fatal error recovery") uses reset_link() to recover from fatal errors. But, if the reset is successful there is no need to continue the rest of the error recovery checks. Also, during fatal error recovery, if the initial value of error status is PCI_ERS_RESULT_DISCONNECT or PCI_ERS_RESULT_NO_AER_DRIVER then even after successful recovery (using reset_link()) pcie_do_recovery() will report the recovery result as failure. So update the status of error after reset_link(). Fixes: bdb5ac85777d ("PCI/ERR: Handle fatal error recovery") Cc: Ashok Raj Cc: Keith Busch Signed-off-by: Kuppuswamy Sathyanarayanan --- drivers/pci/pcie/err.c | 11 ++++++++--- 1 file changed, 8 insertions(+), 3 deletions(-) diff --git a/drivers/pci/pcie/err.c b/drivers/pci/pcie/err.c index 773197a12568..aecec124a829 100644 --- a/drivers/pci/pcie/err.c +++ b/drivers/pci/pcie/err.c @@ -204,9 +204,13 @@ void pcie_do_recovery(struct pci_dev *dev, enum pci_channel_state state, else pci_walk_bus(bus, report_normal_detected, &status); - if (state == pci_channel_io_frozen && - reset_link(dev, service) != PCI_ERS_RESULT_RECOVERED) - goto failed; + if (state == pci_channel_io_frozen) { + status = reset_link(dev, service); + if (status != PCI_ERS_RESULT_RECOVERED) + goto failed; + else + goto done; + } if (status == PCI_ERS_RESULT_CAN_RECOVER) { status = PCI_ERS_RESULT_RECOVERED; @@ -228,6 +232,7 @@ void pcie_do_recovery(struct pci_dev *dev, enum pci_channel_state state, if (status != PCI_ERS_RESULT_RECOVERED) goto failed; +done: pci_dbg(dev, "broadcast resume message\n"); pci_walk_bus(bus, report_resume, &status); From patchwork Fri Jul 26 21:43:12 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kuppuswamy Sathyanarayanan X-Patchwork-Id: 11061855 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 734BE13A4 for ; Fri, 26 Jul 2019 21:46:24 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 6671D28B63 for ; Fri, 26 Jul 2019 21:46:24 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 5A25C28B7F; Fri, 26 Jul 2019 21:46:24 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id CA1E728B63 for ; Fri, 26 Jul 2019 21:46:23 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728576AbfGZVpv (ORCPT ); Fri, 26 Jul 2019 17:45:51 -0400 Received: from mga14.intel.com ([192.55.52.115]:28904 "EHLO mga14.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728502AbfGZVpu (ORCPT ); Fri, 26 Jul 2019 17:45:50 -0400 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga005.fm.intel.com ([10.253.24.32]) by fmsmga103.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 26 Jul 2019 14:45:50 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.64,312,1559545200"; d="scan'208";a="369671133" Received: from skuppusw-desk.jf.intel.com ([10.54.74.33]) by fmsmga005.fm.intel.com with ESMTP; 26 Jul 2019 14:45:50 -0700 From: sathyanarayanan.kuppuswamy@linux.intel.com To: bhelgaas@google.com Cc: linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, ashok.raj@intel.com, keith.busch@intel.com, sathyanarayanan.kuppuswamy@linux.intel.com, "Rafael J. Wysocki" , Len Brown Subject: [PATCH v6 2/9] PCI/ACPI: Add _OSC based negotiation support for DPC Date: Fri, 26 Jul 2019 14:43:12 -0700 Message-Id: <6cd9661f4b7250e0d988eea4b668e2e2f6dae7a8.1564177080.git.sathyanarayanan.kuppuswamy@linux.intel.com> X-Mailer: git-send-email 2.21.0 In-Reply-To: References: MIME-Version: 1.0 Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Kuppuswamy Sathyanarayanan As per PCI firmware specification r3.2 Downstream Port Containment Related Enhancements ECN, sec 4.5.1, table 4-6, OS can use bit 7 of _OSC Control Field to negotiate control over Downstream Port Containment (DPC) configuration of PCIe port. After _OSC negotiation, firmware will Set this bit to grant OS control over PCIe DPC configuration and Clear it if this feature was requested and denied, or was not requested. Cc: Bjorn Helgaas Cc: "Rafael J. Wysocki" Cc: Len Brown Signed-off-by: Kuppuswamy Sathyanarayanan --- drivers/acpi/pci_root.c | 6 ++++++ drivers/pci/pcie/portdrv_core.c | 3 ++- drivers/pci/probe.c | 1 + include/linux/acpi.h | 3 ++- include/linux/pci.h | 2 +- 5 files changed, 12 insertions(+), 3 deletions(-) diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c index 314a187ed572..73b08f40b0da 100644 --- a/drivers/acpi/pci_root.c +++ b/drivers/acpi/pci_root.c @@ -142,6 +142,7 @@ static struct pci_osc_bit_struct pci_osc_control_bit[] = { { OSC_PCI_EXPRESS_AER_CONTROL, "AER" }, { OSC_PCI_EXPRESS_CAPABILITY_CONTROL, "PCIeCapability" }, { OSC_PCI_EXPRESS_LTR_CONTROL, "LTR" }, + { OSC_PCI_EXPRESS_DPC_CONTROL, "DPC" }, }; static void decode_osc_bits(struct acpi_pci_root *root, char *msg, u32 word, @@ -488,6 +489,9 @@ static void negotiate_os_control(struct acpi_pci_root *root, int *no_aspm, control |= OSC_PCI_EXPRESS_AER_CONTROL; } + if (IS_ENABLED(CONFIG_PCIE_DPC)) + control |= OSC_PCI_EXPRESS_DPC_CONTROL; + requested = control; status = acpi_pci_osc_control_set(handle, &control, OSC_PCI_EXPRESS_CAPABILITY_CONTROL); @@ -917,6 +921,8 @@ struct pci_bus *acpi_pci_root_create(struct acpi_pci_root *root, host_bridge->native_pme = 0; if (!(root->osc_control_set & OSC_PCI_EXPRESS_LTR_CONTROL)) host_bridge->native_ltr = 0; + if (!(root->osc_control_set & OSC_PCI_EXPRESS_DPC_CONTROL)) + host_bridge->native_dpc = 0; /* * Evaluate the "PCI Boot Configuration" _DSM Function. If it diff --git a/drivers/pci/pcie/portdrv_core.c b/drivers/pci/pcie/portdrv_core.c index 308c3e0c4a34..58c40fe7856f 100644 --- a/drivers/pci/pcie/portdrv_core.c +++ b/drivers/pci/pcie/portdrv_core.c @@ -252,7 +252,8 @@ static int get_port_device_capability(struct pci_dev *dev) } if (pci_find_ext_capability(dev, PCI_EXT_CAP_ID_DPC) && - pci_aer_available() && services & PCIE_PORT_SERVICE_AER) + pci_aer_available() && services & PCIE_PORT_SERVICE_AER && + (pcie_ports_native || host->native_dpc)) services |= PCIE_PORT_SERVICE_DPC; if (pci_pcie_type(dev) == PCI_EXP_TYPE_DOWNSTREAM || diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c index a3c7338fad86..cf8acdd62089 100644 --- a/drivers/pci/probe.c +++ b/drivers/pci/probe.c @@ -601,6 +601,7 @@ static void pci_init_host_bridge(struct pci_host_bridge *bridge) bridge->native_shpc_hotplug = 1; bridge->native_pme = 1; bridge->native_ltr = 1; + bridge->native_dpc = 1; } struct pci_host_bridge *pci_alloc_host_bridge(size_t priv) diff --git a/include/linux/acpi.h b/include/linux/acpi.h index 9426b9aaed86..8959ed322e15 100644 --- a/include/linux/acpi.h +++ b/include/linux/acpi.h @@ -525,7 +525,8 @@ extern bool osc_pc_lpi_support_confirmed; #define OSC_PCI_EXPRESS_AER_CONTROL 0x00000008 #define OSC_PCI_EXPRESS_CAPABILITY_CONTROL 0x00000010 #define OSC_PCI_EXPRESS_LTR_CONTROL 0x00000020 -#define OSC_PCI_CONTROL_MASKS 0x0000003f +#define OSC_PCI_EXPRESS_DPC_CONTROL 0x00000080 +#define OSC_PCI_CONTROL_MASKS 0x000000ff #define ACPI_GSB_ACCESS_ATTRIB_QUICK 0x00000002 #define ACPI_GSB_ACCESS_ATTRIB_SEND_RCV 0x00000004 diff --git a/include/linux/pci.h b/include/linux/pci.h index 9e700d9f9f28..9145136ca728 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -510,7 +510,7 @@ struct pci_host_bridge { unsigned int native_pme:1; /* OS may use PCIe PME */ unsigned int native_ltr:1; /* OS may use PCIe LTR */ unsigned int preserve_config:1; /* Preserve FW resource setup */ - + unsigned int native_dpc:1; /* OS may use PCIe DPC */ /* Resource alignment requirements */ resource_size_t (*align_resource)(struct pci_dev *dev, const struct resource *res, From patchwork Fri Jul 26 21:43:13 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kuppuswamy Sathyanarayanan X-Patchwork-Id: 11061843 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 11B5713A4 for ; Fri, 26 Jul 2019 21:45:54 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 04A0D28B76 for ; Fri, 26 Jul 2019 21:45:54 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id ECDAD27BA5; Fri, 26 Jul 2019 21:45:53 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id DE38628B78 for ; Fri, 26 Jul 2019 21:45:52 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728559AbfGZVpv (ORCPT ); Fri, 26 Jul 2019 17:45:51 -0400 Received: from mga14.intel.com ([192.55.52.115]:28904 "EHLO mga14.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728554AbfGZVpv (ORCPT ); Fri, 26 Jul 2019 17:45:51 -0400 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga005.fm.intel.com ([10.253.24.32]) by fmsmga103.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 26 Jul 2019 14:45:50 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.64,312,1559545200"; d="scan'208";a="369671136" Received: from skuppusw-desk.jf.intel.com ([10.54.74.33]) by fmsmga005.fm.intel.com with ESMTP; 26 Jul 2019 14:45:50 -0700 From: sathyanarayanan.kuppuswamy@linux.intel.com To: bhelgaas@google.com Cc: linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, ashok.raj@intel.com, keith.busch@intel.com, sathyanarayanan.kuppuswamy@linux.intel.com, "Rafael J. Wysocki" , Len Brown Subject: [PATCH v6 3/9] PCI/ACPI: Expose EDR support via _OSC to BIOS Date: Fri, 26 Jul 2019 14:43:13 -0700 Message-Id: X-Mailer: git-send-email 2.21.0 In-Reply-To: References: MIME-Version: 1.0 Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Kuppuswamy Sathyanarayanan As per PCI firmware specification r3.2 Downstream Port Containment Related Enhancements ECN, sec 4.5.1, table 4-4, if OS supports EDR, it should expose its support to BIOS by setting bit 7 of _OSC Support Field. Cc: Bjorn Helgaas Cc: "Rafael J. Wysocki" Cc: Len Brown Signed-off-by: Kuppuswamy Sathyanarayanan --- drivers/acpi/pci_root.c | 3 +++ include/linux/acpi.h | 1 + 2 files changed, 4 insertions(+) diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c index 73b08f40b0da..988d09d788b6 100644 --- a/drivers/acpi/pci_root.c +++ b/drivers/acpi/pci_root.c @@ -132,6 +132,7 @@ static struct pci_osc_bit_struct pci_osc_support_bit[] = { { OSC_PCI_CLOCK_PM_SUPPORT, "ClockPM" }, { OSC_PCI_SEGMENT_GROUPS_SUPPORT, "Segments" }, { OSC_PCI_MSI_SUPPORT, "MSI" }, + { OSC_PCI_EDR_SUPPORT, "EDR" }, { OSC_PCI_HPX_TYPE_3_SUPPORT, "HPX-Type3" }, }; @@ -442,6 +443,8 @@ static void negotiate_os_control(struct acpi_pci_root *root, int *no_aspm, support |= OSC_PCI_ASPM_SUPPORT | OSC_PCI_CLOCK_PM_SUPPORT; if (pci_msi_enabled()) support |= OSC_PCI_MSI_SUPPORT; + if (IS_ENABLED(CONFIG_PCIE_EDR)) + support |= OSC_PCI_EDR_SUPPORT; decode_osc_support(root, "OS supports", support); status = acpi_pci_osc_support(root, support); diff --git a/include/linux/acpi.h b/include/linux/acpi.h index 8959ed322e15..b6b43da85d26 100644 --- a/include/linux/acpi.h +++ b/include/linux/acpi.h @@ -515,6 +515,7 @@ extern bool osc_pc_lpi_support_confirmed; #define OSC_PCI_CLOCK_PM_SUPPORT 0x00000004 #define OSC_PCI_SEGMENT_GROUPS_SUPPORT 0x00000008 #define OSC_PCI_MSI_SUPPORT 0x00000010 +#define OSC_PCI_EDR_SUPPORT 0x00000080 #define OSC_PCI_HPX_TYPE_3_SUPPORT 0x00000100 #define OSC_PCI_SUPPORT_MASKS 0x0000011f From patchwork Fri Jul 26 21:43:14 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kuppuswamy Sathyanarayanan X-Patchwork-Id: 11061857 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 32FB3746 for ; Fri, 26 Jul 2019 21:46:30 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 2683728B3C for ; Fri, 26 Jul 2019 21:46:30 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 1B16928B83; Fri, 26 Jul 2019 21:46:30 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 80D8F28B45 for ; Fri, 26 Jul 2019 21:46:29 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726617AbfGZVqY (ORCPT ); Fri, 26 Jul 2019 17:46:24 -0400 Received: from mga14.intel.com ([192.55.52.115]:28904 "EHLO mga14.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726999AbfGZVpv (ORCPT ); Fri, 26 Jul 2019 17:45:51 -0400 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga005.fm.intel.com ([10.253.24.32]) by fmsmga103.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 26 Jul 2019 14:45:50 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.64,312,1559545200"; d="scan'208";a="369671140" Received: from skuppusw-desk.jf.intel.com ([10.54.74.33]) by fmsmga005.fm.intel.com with ESMTP; 26 Jul 2019 14:45:50 -0700 From: sathyanarayanan.kuppuswamy@linux.intel.com To: bhelgaas@google.com Cc: linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, ashok.raj@intel.com, keith.busch@intel.com, sathyanarayanan.kuppuswamy@linux.intel.com Subject: [PATCH v6 4/9] PCI/DPC: Allow dpc_probe() even if firmware first mode is enabled Date: Fri, 26 Jul 2019 14:43:14 -0700 Message-Id: <3fbc2b769890718edff2beee1e815bab97156e64.1564177080.git.sathyanarayanan.kuppuswamy@linux.intel.com> X-Mailer: git-send-email 2.21.0 In-Reply-To: References: MIME-Version: 1.0 Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Kuppuswamy Sathyanarayanan As per ACPI specification v6.3, sec 5.6.6, Error Disconnect Recover (EDR) notification used by firmware to let OS know about the DPC event and permit OS to perform error recovery when processing the EDR notification. Also, as per PCI firmware specification r3.2 Downstream Port Containment Related Enhancements ECN, sec 4.5.1, table 4-6, if DPC is controlled by firmware (firmware first mode), it's responsible for initializing Downstream Port Containment Extended Capability Structures per firmware policy. And, OS is permitted to read or write DPC Control and Status registers of a port while processing an Error Disconnect Recover (EDR) notification from firmware on that port. Currently, if firmware controls DPC (firmware first mode), OS will not create/enumerate DPC PCIe port services. But, if OS supports EDR feature, then as mentioned in above spec references, it should permit enumeration of DPC driver and also support handling ACPI EDR notification. So as first step, allow dpc_probe() to continue even if firmware first mode is enabled. Also add appropriate checks to ensure device registers are not modified outside EDR notification window in firmware first mode. This is a preparatory patch for adding EDR support. Signed-off-by: Kuppuswamy Sathyanarayanan --- drivers/pci/pcie/dpc.c | 49 +++++++++++++++++++++++++++++++----------- 1 file changed, 36 insertions(+), 13 deletions(-) diff --git a/drivers/pci/pcie/dpc.c b/drivers/pci/pcie/dpc.c index a32ec3487a8d..9717fda012f8 100644 --- a/drivers/pci/pcie/dpc.c +++ b/drivers/pci/pcie/dpc.c @@ -22,6 +22,8 @@ struct dpc_dev { u16 cap_pos; bool rp_extensions; u8 rp_log_size; + /* Set True if DPC is controlled by firmware */ + bool firmware_dpc; }; static const char * const rp_pio_error_string[] = { @@ -69,6 +71,9 @@ void pci_save_dpc_state(struct pci_dev *dev) if (!dpc) return; + if (dpc->firmware_dpc) + return; + save_state = pci_find_saved_ext_cap(dev, PCI_EXT_CAP_ID_DPC); if (!save_state) return; @@ -90,6 +95,9 @@ void pci_restore_dpc_state(struct pci_dev *dev) if (!dpc) return; + if (dpc->firmware_dpc) + return; + save_state = pci_find_saved_ext_cap(dev, PCI_EXT_CAP_ID_DPC); if (!save_state) return; @@ -291,9 +299,6 @@ static int dpc_probe(struct pcie_device *dev) int status; u16 ctl, cap; - if (pcie_aer_get_firmware_first(pdev)) - return -ENOTSUPP; - dpc = devm_kzalloc(device, sizeof(*dpc), GFP_KERNEL); if (!dpc) return -ENOMEM; @@ -302,13 +307,25 @@ static int dpc_probe(struct pcie_device *dev) dpc->dev = dev; set_service_data(dev, dpc); - status = devm_request_threaded_irq(device, dev->irq, dpc_irq, - dpc_handler, IRQF_SHARED, - "pcie-dpc", dpc); - if (status) { - pci_warn(pdev, "request IRQ%d failed: %d\n", dev->irq, - status); - return status; + if (pcie_aer_get_firmware_first(pdev)) + dpc->firmware_dpc = 1; + + /* + * If DPC is handled in firmware and ACPI support is not enabled + * in OS, skip probe and return error. + */ + if (dpc->firmware_dpc && !IS_ENABLED(CONFIG_ACPI)) + return -ENODEV; + + if (!dpc->firmware_dpc) { + status = devm_request_threaded_irq(device, dev->irq, dpc_irq, + dpc_handler, IRQF_SHARED, + "pcie-dpc", dpc); + if (status) { + pci_warn(pdev, "request IRQ%d failed: %d\n", dev->irq, + status); + return status; + } } pci_read_config_word(pdev, dpc->cap_pos + PCI_EXP_DPC_CAP, &cap); @@ -323,9 +340,12 @@ static int dpc_probe(struct pcie_device *dev) dpc->rp_log_size = 0; } } - - ctl = (ctl & 0xfff4) | PCI_EXP_DPC_CTL_EN_FATAL | PCI_EXP_DPC_CTL_INT_EN; - pci_write_config_word(pdev, dpc->cap_pos + PCI_EXP_DPC_CTL, ctl); + if (!dpc->firmware_dpc) { + ctl = (ctl & 0xfff4) | + (PCI_EXP_DPC_CTL_EN_FATAL | PCI_EXP_DPC_CTL_INT_EN); + pci_write_config_word(pdev, dpc->cap_pos + PCI_EXP_DPC_CTL, + ctl); + } pci_info(pdev, "error containment capabilities: Int Msg #%d, RPExt%c PoisonedTLP%c SwTrigger%c RP PIO Log %d, DL_ActiveErr%c\n", cap & PCI_EXP_DPC_IRQ, FLAG(cap, PCI_EXP_DPC_CAP_RP_EXT), @@ -343,6 +363,9 @@ static void dpc_remove(struct pcie_device *dev) struct pci_dev *pdev = dev->port; u16 ctl; + if (dpc->firmware_dpc) + return; + pci_read_config_word(pdev, dpc->cap_pos + PCI_EXP_DPC_CTL, &ctl); ctl &= ~(PCI_EXP_DPC_CTL_EN_FATAL | PCI_EXP_DPC_CTL_INT_EN); pci_write_config_word(pdev, dpc->cap_pos + PCI_EXP_DPC_CTL, ctl); From patchwork Fri Jul 26 21:43:15 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kuppuswamy Sathyanarayanan X-Patchwork-Id: 11061845 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 980D4746 for ; Fri, 26 Jul 2019 21:45:54 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 8946D285D6 for ; Fri, 26 Jul 2019 21:45:54 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 7DB8F28B3C; Fri, 26 Jul 2019 21:45:54 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 636E328B7C for ; Fri, 26 Jul 2019 21:45:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728593AbfGZVpw (ORCPT ); Fri, 26 Jul 2019 17:45:52 -0400 Received: from mga14.intel.com ([192.55.52.115]:28905 "EHLO mga14.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728557AbfGZVpv (ORCPT ); Fri, 26 Jul 2019 17:45:51 -0400 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga005.fm.intel.com ([10.253.24.32]) by fmsmga103.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 26 Jul 2019 14:45:50 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.64,312,1559545200"; d="scan'208";a="369671144" Received: from skuppusw-desk.jf.intel.com ([10.54.74.33]) by fmsmga005.fm.intel.com with ESMTP; 26 Jul 2019 14:45:50 -0700 From: sathyanarayanan.kuppuswamy@linux.intel.com To: bhelgaas@google.com Cc: linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, ashok.raj@intel.com, keith.busch@intel.com, sathyanarayanan.kuppuswamy@linux.intel.com Subject: [PATCH v6 5/9] PCI/DPC: Add dpc_process_error() wrapper function Date: Fri, 26 Jul 2019 14:43:15 -0700 Message-Id: <13fec83690edb60e913f02cbd53e7cf748210173.1564177080.git.sathyanarayanan.kuppuswamy@linux.intel.com> X-Mailer: git-send-email 2.21.0 In-Reply-To: References: MIME-Version: 1.0 Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Kuppuswamy Sathyanarayanan With Error Disconnect Recover (EDR) support, we need to support processing DPC event either from DPC IRQ or ACPI EDR event. So create a wrapper function dpc_process_error() and move common error handling code in to it. It will be used to process the DPC event in both DPC IRQ and EDR ACPI event contexts. Signed-off-by: Kuppuswamy Sathyanarayanan --- drivers/pci/pcie/dpc.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) diff --git a/drivers/pci/pcie/dpc.c b/drivers/pci/pcie/dpc.c index 9717fda012f8..4137ec7b48cc 100644 --- a/drivers/pci/pcie/dpc.c +++ b/drivers/pci/pcie/dpc.c @@ -232,10 +232,9 @@ static int dpc_get_aer_uncorrect_severity(struct pci_dev *dev, return 1; } -static irqreturn_t dpc_handler(int irq, void *context) +static void dpc_process_error(struct dpc_dev *dpc) { struct aer_err_info info; - struct dpc_dev *dpc = context; struct pci_dev *pdev = dpc->dev->port; u16 cap = dpc->cap_pos, status, source, reason, ext_reason; @@ -268,6 +267,13 @@ static irqreturn_t dpc_handler(int irq, void *context) /* We configure DPC so it only triggers on ERR_FATAL */ pcie_do_recovery(pdev, pci_channel_io_frozen, PCIE_PORT_SERVICE_DPC); +} + +static irqreturn_t dpc_handler(int irq, void *context) +{ + struct dpc_dev *dpc = context; + + dpc_process_error(dpc); return IRQ_HANDLED; } From patchwork Fri Jul 26 21:43:16 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kuppuswamy Sathyanarayanan X-Patchwork-Id: 11061853 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 63F49746 for ; Fri, 26 Jul 2019 21:46:16 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 5620F28B7B for ; Fri, 26 Jul 2019 21:46:16 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 3DD3328B95; Fri, 26 Jul 2019 21:46:16 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 4D68528B8A for ; Fri, 26 Jul 2019 21:46:15 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728661AbfGZVqO (ORCPT ); Fri, 26 Jul 2019 17:46:14 -0400 Received: from mga14.intel.com ([192.55.52.115]:28904 "EHLO mga14.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728572AbfGZVpw (ORCPT ); Fri, 26 Jul 2019 17:45:52 -0400 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga005.fm.intel.com ([10.253.24.32]) by fmsmga103.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 26 Jul 2019 14:45:50 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.64,312,1559545200"; d="scan'208";a="369671147" Received: from skuppusw-desk.jf.intel.com ([10.54.74.33]) by fmsmga005.fm.intel.com with ESMTP; 26 Jul 2019 14:45:50 -0700 From: sathyanarayanan.kuppuswamy@linux.intel.com To: bhelgaas@google.com Cc: linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, ashok.raj@intel.com, keith.busch@intel.com, sathyanarayanan.kuppuswamy@linux.intel.com Subject: [PATCH v6 6/9] PCI/DPC: Add Error Disconnect Recover (EDR) support Date: Fri, 26 Jul 2019 14:43:16 -0700 Message-Id: <069c1e8378ed73c5e81dffa6299a1b11e77611cd.1564177080.git.sathyanarayanan.kuppuswamy@linux.intel.com> X-Mailer: git-send-email 2.21.0 In-Reply-To: References: MIME-Version: 1.0 Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Kuppuswamy Sathyanarayanan As per ACPI specification r6.3, sec 5.6.6, when firmware owns Downstream Port Containment (DPC), its expected to use the "Error Disconnect Recover" (EDR) notification to alert OSPM of a DPC event and if OS supports EDR, its expected to handle the software state invalidation and port recovery in OS, and also let firmware know the recovery status via _OST ACPI call. Related _OST status codes can be found in ACPI specification r6.3, sec 6.3.5.2. Also, as per PCI firmware specification r3.2 Downstream Port Containment Related Enhancements ECN, sec 4.5.1, table 4-6, If DPC is controlled by firmware (firmware first mode), firmware is responsible for configuring the DPC and OS is responsible for error recovery. Also, OS is allowed to modify DPC registers only during the EDR notification window. So with EDR support, OS should provide DPC port services even in firmware first mode. Cc: Keith Busch Signed-off-by: Kuppuswamy Sathyanarayanan --- drivers/pci/pci-acpi.c | 91 +++++++++++++++++++++++ drivers/pci/pcie/Kconfig | 10 +++ drivers/pci/pcie/dpc.c | 127 +++++++++++++++++++++++++++++++- drivers/pci/pcie/portdrv_core.c | 9 ++- include/linux/pci-acpi.h | 11 +++ 5 files changed, 245 insertions(+), 3 deletions(-) diff --git a/drivers/pci/pci-acpi.c b/drivers/pci/pci-acpi.c index 45049f558860..82abab25daf2 100644 --- a/drivers/pci/pci-acpi.c +++ b/drivers/pci/pci-acpi.c @@ -104,6 +104,97 @@ int acpi_get_rc_resources(struct device *dev, const char *hid, u16 segment, } #endif +#if defined(CONFIG_PCIE_DPC) && defined(CONFIG_ACPI) + +/* + * _DSM wrapper function to enable/disable DPC port. + * @dpc : DPC device structure + * @enable: status of DPC port (0 or 1). + * + * returns 0 on success or errno on failure. + */ +int acpi_enable_dpc_port(struct pci_dev *pdev, acpi_handle handle, bool enable) +{ + union acpi_object *obj; + int status = 0; + union acpi_object argv4; + + argv4.type = ACPI_TYPE_INTEGER; + argv4.integer.value = enable; + + obj = acpi_evaluate_dsm(handle, &pci_acpi_dsm_guid, 1, + EDR_PORT_ENABLE_DSM, &argv4); + if (!obj) + return -EIO; + + if (obj->type != ACPI_TYPE_INTEGER || obj->integer.value != enable) + status = -EIO; + + ACPI_FREE(obj); + + return status; +} + +/* + * _DSM wrapper function to locate DPC port. + * @dpc : DPC device structure + * + * returns pci_dev or NULL. + */ +struct pci_dev *acpi_locate_dpc_port(struct pci_dev *pdev, acpi_handle handle) +{ + union acpi_object *obj; + u16 port; + + obj = acpi_evaluate_dsm(handle, &pci_acpi_dsm_guid, 1, + EDR_PORT_LOCATE_DSM, NULL); + if (!obj) + return pci_dev_get(pdev); + + if (obj->type != ACPI_TYPE_INTEGER) { + ACPI_FREE(obj); + return NULL; + } + + /* + * Firmware returns DPC port BDF details in following format: + * 15:8 = bus + * 7:3 = device + * 2:0 = function + */ + port = obj->integer.value; + + ACPI_FREE(obj); + + return pci_get_domain_bus_and_slot(pci_domain_nr(pdev->bus), + PCI_BUS_NUM(port), port & 0xff); +} + +/* + * _OST wrapper function to let firmware know the status of EDR event. + * @dpc : DPC device structure. + * @status: Status of EDR event. + */ +int acpi_send_edr_status(struct pci_dev *pdev, acpi_handle handle, u16 status) +{ + u32 ost_status; + + pci_dbg(pdev, "Sending EDR status :%x\n", status); + + ost_status = PCI_DEVID(pdev->bus->number, pdev->devfn); + ost_status = (ost_status << 16) | status; + + status = acpi_evaluate_ost(handle, + ACPI_NOTIFY_DISCONNECT_RECOVER, + ost_status, NULL); + if (ACPI_FAILURE(status)) + return -EINVAL; + + return 0; +} + +#endif /* CONFIG_PCIE_DPC && CONFIG_ACPI */ + phys_addr_t acpi_pci_root_get_mcfg_addr(acpi_handle handle) { acpi_status status = AE_NOT_EXIST; diff --git a/drivers/pci/pcie/Kconfig b/drivers/pci/pcie/Kconfig index 362eb8cfa53b..9a05015af7cd 100644 --- a/drivers/pci/pcie/Kconfig +++ b/drivers/pci/pcie/Kconfig @@ -150,3 +150,13 @@ config PCIE_BW This enables PCI Express Bandwidth Change Notification. If you know link width or rate changes occur only to correct unreliable links, you may answer Y. + +config PCIE_EDR + bool "PCI Express Error Disconnect Recover support" + default n + depends on PCIE_DPC && ACPI + help + This options adds Error Disconnect Recover support as specified + in PCI firmware specification v3.2 Downstream Port Containment + Related Enhancements ECN. Enable this if you want to support hybrid + DPC model which uses both firmware and OS to implement DPC. diff --git a/drivers/pci/pcie/dpc.c b/drivers/pci/pcie/dpc.c index 4137ec7b48cc..6e350149d793 100644 --- a/drivers/pci/pcie/dpc.c +++ b/drivers/pci/pcie/dpc.c @@ -13,6 +13,8 @@ #include #include #include +#include +#include #include "portdrv.h" #include "../pci.h" @@ -24,6 +26,11 @@ struct dpc_dev { u8 rp_log_size; /* Set True if DPC is controlled by firmware */ bool firmware_dpc; + pci_ers_result_t error_state; + struct mutex edr_lock; +#ifdef CONFIG_ACPI + struct acpi_device *adev; +#endif }; static const char * const rp_pio_error_string[] = { @@ -152,6 +159,9 @@ static pci_ers_result_t dpc_reset_link(struct pci_dev *pdev) if (!pcie_wait_for_link(pdev, true)) return PCI_ERS_RESULT_DISCONNECT; + /* Since the device recovery is done just update the error state */ + dpc->error_state = PCI_ERS_RESULT_RECOVERED; + return PCI_ERS_RESULT_RECOVERED; } @@ -296,13 +306,92 @@ static irqreturn_t dpc_irq(int irq, void *context) return IRQ_HANDLED; } +static void dpc_error_resume(struct pci_dev *dev) +{ + struct dpc_dev *dpc = to_dpc_dev(dev); + + dpc->error_state = PCI_ERS_RESULT_RECOVERED; +} + +#ifdef CONFIG_ACPI + +static void edr_handle_event(acpi_handle handle, u32 event, void *data) +{ + struct dpc_dev *dpc = (struct dpc_dev *) data; + struct pci_dev *pdev = dpc->dev->port; + u16 status; + + pci_info(pdev, "ACPI event %x received\n", event); + + if (event != ACPI_NOTIFY_DISCONNECT_RECOVER) + return; + + /* + * Check if _DSM(0xD) is available, and if present locate the + * port which issued EDR event. + */ + pdev = acpi_locate_dpc_port(pdev, dpc->adev->handle); + if (!pdev) { + pdev = dpc->dev->port; + pci_err(pdev, "No valid port found\n"); + return; + } + + dpc = to_dpc_dev(pdev); + if (!dpc) { + pci_err(pdev, "DPC port is NULL\n"); + goto done; + } + + mutex_lock(&dpc->edr_lock); + + dpc->error_state = PCI_ERS_RESULT_DISCONNECT; + + /* + * Check if the port supports DPC: + * + * If port supports DPC, then fall back to default error + * recovery. + */ + if (dpc->cap_pos) { + /* Check if there is a valid DPC trigger */ + pci_read_config_word(pdev, dpc->cap_pos + PCI_EXP_DPC_STATUS, + &status); + if (!(status & PCI_EXP_DPC_STATUS_TRIGGER)) { + pci_err(pdev, "Invalid DPC trigger %x\n", status); + goto edr_unlock; + } + dpc_process_error(dpc); + } + + /* + * If recovery is successful, send _OST(0xF, BDF << 16 | 0x80) + * to firmware. If not successful, send _OST(0xF, BDF << 16 | 0x81). + */ + if (dpc->error_state == PCI_ERS_RESULT_RECOVERED) + status = 0x80; + else + status = 0x81; + + acpi_send_edr_status(pdev, dpc->adev->handle, status); + +edr_unlock: + mutex_unlock(&dpc->edr_lock); +done: + pci_dev_put(pdev); + + return; +} + +#endif + #define FLAG(x, y) (((x) & (y)) ? '+' : '-') static int dpc_probe(struct pcie_device *dev) { struct dpc_dev *dpc; struct pci_dev *pdev = dev->port; struct device *device = &dev->device; - int status; + int status = 0; u16 ctl, cap; dpc = devm_kzalloc(device, sizeof(*dpc), GFP_KERNEL); @@ -312,6 +401,8 @@ static int dpc_probe(struct pcie_device *dev) dpc->cap_pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_DPC); dpc->dev = dev; set_service_data(dev, dpc); + dpc->error_state = PCI_ERS_RESULT_NONE; + mutex_init(&dpc->edr_lock); if (pcie_aer_get_firmware_first(pdev)) dpc->firmware_dpc = 1; @@ -334,6 +425,39 @@ static int dpc_probe(struct pcie_device *dev) } } +#ifdef CONFIG_ACPI + if (dpc->firmware_dpc) { + struct acpi_device *adev = ACPI_COMPANION(&pdev->dev); + acpi_status astatus; + + if (!adev) { + pci_err(pdev, "No valid ACPI device found\n"); + return -ENODEV; + } + + dpc->adev = adev; + + astatus = acpi_install_notify_handler(adev->handle, + ACPI_SYSTEM_NOTIFY, + edr_handle_event, + dpc); + + if (ACPI_FAILURE(astatus)) { + pci_err(pdev, + "Install ACPI_SYSTEM_NOTIFY handler failed\n"); + return -EBUSY; + } + + status = acpi_enable_dpc_port(pdev, adev->handle, true); + if (status) { + pci_err(pdev, "Enable DPC port failed\n"); + acpi_remove_notify_handler(adev->handle, + ACPI_SYSTEM_NOTIFY, + edr_handle_event); + return status; + } + } +#endif pci_read_config_word(pdev, dpc->cap_pos + PCI_EXP_DPC_CAP, &cap); pci_read_config_word(pdev, dpc->cap_pos + PCI_EXP_DPC_CTL, &ctl); @@ -384,6 +508,7 @@ static struct pcie_port_service_driver dpcdriver = { .probe = dpc_probe, .remove = dpc_remove, .reset_link = dpc_reset_link, + .error_resume = dpc_error_resume, }; int __init pcie_dpc_init(void) diff --git a/drivers/pci/pcie/portdrv_core.c b/drivers/pci/pcie/portdrv_core.c index 58c40fe7856f..acf3a9ec2227 100644 --- a/drivers/pci/pcie/portdrv_core.c +++ b/drivers/pci/pcie/portdrv_core.c @@ -251,9 +251,14 @@ static int get_port_device_capability(struct pci_dev *dev) pcie_pme_interrupt_enable(dev, false); } + /* + * If EDR support is enabled in OS, then even if AER is not handled in + * OS, DPC service can be enabled. + */ if (pci_find_ext_capability(dev, PCI_EXT_CAP_ID_DPC) && - pci_aer_available() && services & PCIE_PORT_SERVICE_AER && - (pcie_ports_native || host->native_dpc)) + ((IS_ENABLED(CONFIG_PCIE_EDR) && !host->native_dpc) || + (pci_aer_available() && services & PCIE_PORT_SERVICE_AER && + (pcie_ports_native || host->native_dpc)))) services |= PCIE_PORT_SERVICE_DPC; if (pci_pcie_type(dev) == PCI_EXP_TYPE_DOWNSTREAM || diff --git a/include/linux/pci-acpi.h b/include/linux/pci-acpi.h index 62b7fdcc661c..36ffe1e16e69 100644 --- a/include/linux/pci-acpi.h +++ b/include/linux/pci-acpi.h @@ -117,6 +117,17 @@ static inline void acpi_pci_add_bus(struct pci_bus *bus) { } static inline void acpi_pci_remove_bus(struct pci_bus *bus) { } #endif /* CONFIG_ACPI */ +#if defined(CONFIG_PCIE_DPC) && defined(CONFIG_ACPI) +#define EDR_PORT_ENABLE_DSM 0x0C +#define EDR_PORT_LOCATE_DSM 0x0D +int acpi_enable_dpc_port(struct pci_dev *pdev, acpi_handle handle, + bool enable); +struct pci_dev *acpi_locate_dpc_port(struct pci_dev *pdev, + acpi_handle handle); +int acpi_send_edr_status(struct pci_dev *pdev, + acpi_handle handle, u16 status); +#endif + #ifdef CONFIG_ACPI_APEI extern bool aer_acpi_firmware_first(void); #else From patchwork Fri Jul 26 21:43:17 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kuppuswamy Sathyanarayanan X-Patchwork-Id: 11061849 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id BF8AE13A4 for ; Fri, 26 Jul 2019 21:46:14 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id B403D28B78 for ; Fri, 26 Jul 2019 21:46:14 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id A84A028B81; Fri, 26 Jul 2019 21:46:14 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 4B13028B78 for ; Fri, 26 Jul 2019 21:46:14 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728610AbfGZVpx (ORCPT ); Fri, 26 Jul 2019 17:45:53 -0400 Received: from mga14.intel.com ([192.55.52.115]:28905 "EHLO mga14.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728562AbfGZVpw (ORCPT ); Fri, 26 Jul 2019 17:45:52 -0400 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga005.fm.intel.com ([10.253.24.32]) by fmsmga103.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 26 Jul 2019 14:45:50 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.64,312,1559545200"; d="scan'208";a="369671150" Received: from skuppusw-desk.jf.intel.com ([10.54.74.33]) by fmsmga005.fm.intel.com with ESMTP; 26 Jul 2019 14:45:50 -0700 From: sathyanarayanan.kuppuswamy@linux.intel.com To: bhelgaas@google.com Cc: linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, ashok.raj@intel.com, keith.busch@intel.com, sathyanarayanan.kuppuswamy@linux.intel.com Subject: [PATCH v6 7/9] PCI/AER: Allow clearing Error Status Register in FF mode Date: Fri, 26 Jul 2019 14:43:17 -0700 Message-Id: <717b6e3ec41eefff16d4c7b24f46f140eb4fbf02.1564177080.git.sathyanarayanan.kuppuswamy@linux.intel.com> X-Mailer: git-send-email 2.21.0 In-Reply-To: References: MIME-Version: 1.0 Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Kuppuswamy Sathyanarayanan As per PCI firmware specification r3.2 Downstream Port Containment Related Enhancements ECN, sec 4.5.1, table 4-6, Error Disconnect Recover (EDR) support allows OS to handle error recovery and clearing Error Registers even in FF mode. So remove FF mode checks in pci_cleanup_aer_uncorrect_error_status(), pci_aer_clear_fatal_status() and pci_cleanup_aer_error_status_regs() functions. Signed-off-by: Kuppuswamy Sathyanarayanan --- drivers/pci/pcie/aer.c | 12 ++---------- 1 file changed, 2 insertions(+), 10 deletions(-) diff --git a/drivers/pci/pcie/aer.c b/drivers/pci/pcie/aer.c index b45bc47d04fe..e1509bb900c5 100644 --- a/drivers/pci/pcie/aer.c +++ b/drivers/pci/pcie/aer.c @@ -383,9 +383,6 @@ int pci_cleanup_aer_uncorrect_error_status(struct pci_dev *dev) if (!pos) return -EIO; - if (pcie_aer_get_firmware_first(dev)) - return -EIO; - /* Clear status bits for ERR_NONFATAL errors only */ pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_STATUS, &status); pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_SEVER, &sev); @@ -406,9 +403,6 @@ void pci_aer_clear_fatal_status(struct pci_dev *dev) if (!pos) return; - if (pcie_aer_get_firmware_first(dev)) - return; - /* Clear status bits for ERR_FATAL errors only */ pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_STATUS, &status); pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_SEVER, &sev); @@ -430,9 +424,6 @@ int pci_cleanup_aer_error_status_regs(struct pci_dev *dev) if (!pos) return -EIO; - if (pcie_aer_get_firmware_first(dev)) - return -EIO; - port_type = pci_pcie_type(dev); if (port_type == PCI_EXP_TYPE_ROOT_PORT) { pci_read_config_dword(dev, pos + PCI_ERR_ROOT_STATUS, &status); @@ -455,7 +446,8 @@ void pci_aer_init(struct pci_dev *dev) if (dev->aer_cap) dev->aer_stats = kzalloc(sizeof(struct aer_stats), GFP_KERNEL); - pci_cleanup_aer_error_status_regs(dev); + if (!pcie_aer_get_firmware_first(dev)) + pci_cleanup_aer_error_status_regs(dev); } void pci_aer_exit(struct pci_dev *dev) From patchwork Fri Jul 26 21:43:18 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kuppuswamy Sathyanarayanan X-Patchwork-Id: 11061847 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 4DD6513A4 for ; Fri, 26 Jul 2019 21:45:55 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 41E2128B78 for ; Fri, 26 Jul 2019 21:45:55 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 3673128905; Fri, 26 Jul 2019 21:45:55 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id D59A128905 for ; Fri, 26 Jul 2019 21:45:54 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728614AbfGZVpx (ORCPT ); Fri, 26 Jul 2019 17:45:53 -0400 Received: from mga14.intel.com ([192.55.52.115]:28904 "EHLO mga14.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728599AbfGZVpw (ORCPT ); Fri, 26 Jul 2019 17:45:52 -0400 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga005.fm.intel.com ([10.253.24.32]) by fmsmga103.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 26 Jul 2019 14:45:51 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.64,312,1559545200"; d="scan'208";a="369671153" Received: from skuppusw-desk.jf.intel.com ([10.54.74.33]) by fmsmga005.fm.intel.com with ESMTP; 26 Jul 2019 14:45:50 -0700 From: sathyanarayanan.kuppuswamy@linux.intel.com To: bhelgaas@google.com Cc: linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, ashok.raj@intel.com, keith.busch@intel.com, sathyanarayanan.kuppuswamy@linux.intel.com Subject: [PATCH v6 8/9] PCI/DPC: Update comments related to DPC recovery on NON_FATAL errors Date: Fri, 26 Jul 2019 14:43:18 -0700 Message-Id: X-Mailer: git-send-email 2.21.0 In-Reply-To: References: MIME-Version: 1.0 Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Kuppuswamy Sathyanarayanan Currently, in native mode, DPC driver is configured to trigger DPC only for FATAL errors and hence it only supports port recovery for FATAL errors. But with Error Disconnect Recover (EDR) support, DPC configuration is done by firmware, and hence we should expect DPC triggered for both FATAL/NON_FATAL errors. So update comments and add details about how NON_FATAL dpc recovery is handled. Signed-off-by: Kuppuswamy Sathyanarayanan --- drivers/pci/pcie/dpc.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/drivers/pci/pcie/dpc.c b/drivers/pci/pcie/dpc.c index 6e350149d793..369df422692f 100644 --- a/drivers/pci/pcie/dpc.c +++ b/drivers/pci/pcie/dpc.c @@ -275,7 +275,11 @@ static void dpc_process_error(struct dpc_dev *dpc) pci_aer_clear_fatal_status(pdev); } - /* We configure DPC so it only triggers on ERR_FATAL */ + /* + * Irrespective of whether the DPC event is triggered by + * ERR_FATAL or ERR_NONFATAL, since the link is already down, + * use the FATAL error recovery path for both cases. + */ pcie_do_recovery(pdev, pci_channel_io_frozen, PCIE_PORT_SERVICE_DPC); } From patchwork Fri Jul 26 21:43:19 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kuppuswamy Sathyanarayanan X-Patchwork-Id: 11061851 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 17C7F746 for ; Fri, 26 Jul 2019 21:46:15 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 099D828B7B for ; Fri, 26 Jul 2019 21:46:15 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id F24D928B78; Fri, 26 Jul 2019 21:46:14 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id A502028B7C for ; Fri, 26 Jul 2019 21:46:14 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726360AbfGZVqN (ORCPT ); Fri, 26 Jul 2019 17:46:13 -0400 Received: from mga14.intel.com ([192.55.52.115]:28907 "EHLO mga14.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728602AbfGZVpw (ORCPT ); Fri, 26 Jul 2019 17:45:52 -0400 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga005.fm.intel.com ([10.253.24.32]) by fmsmga103.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 26 Jul 2019 14:45:51 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.64,312,1559545200"; d="scan'208";a="369671157" Received: from skuppusw-desk.jf.intel.com ([10.54.74.33]) by fmsmga005.fm.intel.com with ESMTP; 26 Jul 2019 14:45:51 -0700 From: sathyanarayanan.kuppuswamy@linux.intel.com To: bhelgaas@google.com Cc: linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, ashok.raj@intel.com, keith.busch@intel.com, sathyanarayanan.kuppuswamy@linux.intel.com Subject: [PATCH v6 9/9] PCI/DPC: Clear AER registers in EDR mode Date: Fri, 26 Jul 2019 14:43:19 -0700 Message-Id: <7111ba701f2bac1b991fe6710dd963d7e2cdb2f9.1564177080.git.sathyanarayanan.kuppuswamy@linux.intel.com> X-Mailer: git-send-email 2.21.0 In-Reply-To: References: MIME-Version: 1.0 Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Kuppuswamy Sathyanarayanan As per PCI firmware specification r3.2 Downstream Port Containment Related Enhancements ECN, OS is responsible for clearing the AER registers in EDR mode. So clear AER registers in dpc_process_error() function. Signed-off-by: Kuppuswamy Sathyanarayanan --- drivers/pci/pcie/dpc.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/pci/pcie/dpc.c b/drivers/pci/pcie/dpc.c index 369df422692f..115590ad10ed 100644 --- a/drivers/pci/pcie/dpc.c +++ b/drivers/pci/pcie/dpc.c @@ -275,6 +275,10 @@ static void dpc_process_error(struct dpc_dev *dpc) pci_aer_clear_fatal_status(pdev); } + /* In EDR mode, OS is responsible for clearing AER registers */ + if (dpc->firmware_dpc) + pci_cleanup_aer_error_status_regs(pdev); + /* * Irrespective of whether the DPC event is triggered by * ERR_FATAL or ERR_NONFATAL, since the link is already down,